yy - from HP's post #10
Basically in the type I fly we have 2 main altimeters and 1 standby. The standby is ALWAYS set to 1013mb and the mains adjusted as we climb in accordance with SOPs (both mains are always sets the same).
So if we were to go to 1013mb when cleared to a flight level then we would have no altimeter set to QNH should ATC wish to stop our climb at an altitude. By keeping the main altimeters on QNH we can “express our vertical position in terms of FL” by reading off the standby AND stop the climb at any altitude as required.
....and thence the problem and why JD and I (at least) think his airline should review the SOPs.
Edit: Now we can add 'Max Angle'
Last edited by BOAC; 25th May 2008 at 07:00.